19428885378 has 96 divisors (see below), whose sum is σ = 50503864320. Its totient is φ = 5280927840.

The previous prime is 19428885317. The next prime is 19428885389. The reversal of 19428885378 is 87358882491.

19428885378 is a `hidden beast` number, since 1 + 94 + 2 + 8 + 8 + 8 + 537 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 188301 + ... + 272607.

It is an arithmetic number, because the mean of its divisors is an integer number (526081920).

Almost surely, 2^19428885378 is an apocalyptic number.

19428885378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19428885378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25251932160).

19428885378 is an abundant number, since it is smaller than the sum of its proper divisors (31074978942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19428885378 is a wasteful number, since it uses less digits than its factorization.

19428885378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84412 (or 84409 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 19428885378 in words is "nineteen billion, four hundred twenty-eight million, eight hundred eighty-five thousand, three hundred seventy-eight".